US8670026B2 - Video display apparatus capable of viewing videos by a plurality of persons using a plurality of shutter eyeglasses and method for controlling same - Google Patents
Video display apparatus capable of viewing videos by a plurality of persons using a plurality of shutter eyeglasses and method for controlling same Download PDFInfo
- Publication number
- US8670026B2 US8670026B2 US12/908,560 US90856010A US8670026B2 US 8670026 B2 US8670026 B2 US 8670026B2 US 90856010 A US90856010 A US 90856010A US 8670026 B2 US8670026 B2 US 8670026B2
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- video content
- content items
- video
- viewed
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
- H04N13/341—Displays for viewing with the aid of special glasses or head-mounted displays [HMD] using temporal multiplexing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N2013/40—Privacy aspects, i.e. devices showing different images to different viewers, the images not being viewpoints of the same scene
- H04N2013/403—Privacy aspects, i.e. devices showing different images to different viewers, the images not being viewpoints of the same scene the images being monoscopic
Definitions
- the present invention relates to a video display apparatus that is capable of viewing videos by a plurality of persons using a plurality of shutter eyeglasses, and a method for controlling the same.
- Japanese Patent Laid-Open No. 08-043766 discloses a stereoscopic video system, a composite video depiction system, and the like that can cause viewers to recognize only a specific screen from three-dimensional videos or a plurality of screens.
- Japanese Patent Laid-Open No. 10-240212 discloses a system in which a plurality of different video content items can be synchronously viewed by a plurality of persons using a plurality of shutter eyeglasses.
- N video signals are periodically displayed on the same screen by time-division.
- the plurality of shutter eyeglasses open and close in response to the period of the selected video signal.
- the frame rate (refresh rate) for the display device is not changed even when the number of video content items to be viewed is changed. More specifically, even when four persons view the same video content, the inputs from the four input terminals are still in effect, and their subsequent processing sections also always need to be operated continuously, whereby the load of the entire system is not reduced. In order to optimize the load of the entire system, it is contemplated that the frame rate (refresh rate) of the display device can be switched when the number of video content items to be viewed has been changed.
- the discontinuous frame of the synchronization signal occurs during switching, the video image is likely to break up. More specifically, since the timing of the synchronization signal also changes in association with the frame rate (refresh rate), the operation of the display device side immediately after a change in frame rate becomes unstable, resulting in the breaking up of the video image or drop-out of video images.
- the present invention provides a video display apparatus in which the viewers can ensure that there is no viewing of video images that have broken up when the frame rates of the video content items are changed in association with the change in the number of video content items which are to be viewed.
- a video display apparatus which outputs a plurality of video content items to a display section by time-division such that the plurality of different video content items are viewable to a plurality of persons by using a plurality of shutter eyeglasses and performs the shutter control of the plurality of shutter eyeglasses in association with the video content items which are to be viewed, is provided that includes a processing unit configured to apply time-division processing to the plurality of video content items for outputting the resulting video content items on the display section; and a control unit configured to control a frame rate of the video content items, which are output on the display section by the processing unit, depending on the number of video content items which are to be viewed and to perform the shutter control of the plurality of shutter eyeglasses.
- the control unit changes the frame rate of the video content items, which are output by the processing unit on the display section, and controls the shutters of the plurality of shutter eyeglasses to be closed for the frame period of the video content items that are firstly output after a change of the frame rate.
- the viewers can ensure that the breaking up of video images is not viewed when the frame rates of the video content items are changed in association with the change in the number of video content items which are to be viewed.
- FIG. 1 is a functional block diagram illustrating an example of the system configuration according to an embodiment of the present invention.
- FIG. 2 is a timing chart illustrating an example of synchronization control during normal operation.
- FIG. 3 is an operational flowchart when the number of video content items is increased.
- FIG. 4 is a timing chart when the number of video content items is increased from two to three.
- FIG. 5 is an operational flowchart when the number of video content items is decreased.
- FIG. 6A is a timing chart when the number of video content items is decreased.
- FIG. 6B is a timing chart when the number of video content items is decreased.
- FIG. 7A is a timing chart illustrating another example of operation control when the number of video content items is decreased.
- FIG. 7B is a timing chart illustrating another example of operation control when the number of video content items is decreased.
- FIG. 1 is a block diagram illustrating an example of the system configuration according to an embodiment of the present invention.
- the number of viewable video content items and the number of viewers are assumed to be three.
- the present invention is applicable to a system that is viewable by two or more users.
- the present system includes a video display apparatus 100 , shutter eyeglasses 200 a to 200 c , an antenna 300 , and playback apparatus 400 a to 400 c.
- the video display apparatus 100 can input a broadcast signal or an outer input signal through independent three systems, and has a video time-division display function.
- the antenna 300 receives a broadcast wave, and a broadcast signal is input to input processing sections 101 a to 101 c , respectively.
- Each of the playback apparatus 400 a to 400 c reproduces information recorded on a recording medium, and transmits a video signal, a audio signal, and the like to the video display apparatus 100 .
- Examples of the playback apparatus 400 a to 400 c include a DVD (Digital Versatile Disc) player, a BD (Blu-ray Disc) player, and the like.
- the read disk information is subjected to decoding processing, and a video/audio signal is output from an output terminal such as an HDMI (High-Definition Multimedia Interface) terminal or the like.
- Each of the input processing sections 101 a to 101 c performs the switching between a broadcast reception process and an external input process and the channel selection of broadcast channels in accordance with control commands issued from a control section A 102 to be described below.
- each of the input processing sections receives a broadcast signal from the antenna 300 , and decodes the signal into video data and audio data for outputting to a memory 103 .
- an HDMI terminal is employed as an external input terminal.
- a video/audio signal output from each of the playback apparatus 400 a to 400 c is input from an HDMI terminal, and each of the input processing sections outputs video data and audio data to the memory 103 .
- a reception section A 106 receives a wireless signal regarding operation instructions made by an operation input section 207 provided in each of the shutter eyeglasses 200 a to 200 c to be described below, and transmits the content of the instruction to the control section A 102 .
- the control section A 102 controls the respective sections by receiving an operation instruction signal from the reception section A 106 .
- operation information generated by the operation input section 207 provided in each of the shutter eyeglasses 200 a to 200 c to be described below eyeglass power ON/OFF information, broadcast channel selection instruction information, input switch operation information, and the like are transmitted from the reception section A 106 to the control section A 102 .
- the control section A 102 provides instructions to the input processing sections 101 a to 101 c about the switching between broadcast reception and external input and the channel selection of broadcast channels.
- the control section A 102 controls a video time-division output processing section 104 , a audio encoding section 107 , and the like, all of which are to be described below, and the details of which are described below.
- the memory 103 is a storage device that is used for the primary storage of video data and audio data input from the input processing sections 101 a to 101 c .
- a maximum of three video content items can be input at a time.
- a frame buffer for alternately performing input/output of video data a buffer for six video frames is provided.
- Video data read from the memory 103 is sequentially output to the video time-division output processing section 104 .
- the read audio data is output to the audio encoding section 107 .
- the audio encoding section 107 adds the identification data for the shutter eyeglasses 200 a to 200 c to be described below to audio data read from the memory 103 and transmits the resulting data to a transmission section A 108 .
- the video time-division output processing section 104 applies time-division processing to video data read from the memory 103 by controlling the control section A 102 to output the resulting data to the display section 105 .
- Video data is time-division duplexed at the frame rate depending on the number of video content items to be displayed such that the video content items can be viewed by a plurality of persons, and the time-division duplexed data is output to the display section 105 .
- the control section A 102 determines the number of video content items to be displayed based on the operation information, and sets the frame rate of time-division display with respect to the video time-division output processing section 104 .
- the control section A 102 also determines the display sequence of video content items to be time-division duplexed, and sets the determined display sequence in the video time-division output processing section 104 . With this setting, the display sequence of video content items to be time-division duplexed is changed.
- the reception section A 106 and the transmission section A 108 configure an infrared wireless communication interface section between the shutter eyeglasses 200 a to 200 c to be described below.
- the transmission section A 108 transmits a shutter control signal for controlling a shutter driving section 203 and a audio signal to the reception section B 201 of each of the shutter eyeglasses.
- the shutter eyeglass 200 a Since the configuration of the shutter eyeglasses 200 b and 200 c is the same as that of the shutter eyeglass 200 a , duplicated description thereof will be omitted here.
- the operation of the shutter eyeglasses is controlled in association with the operation of the video display apparatus 100 .
- the shutter eyeglass 200 a includes a shutter section 204 for realizing time-division control, a headphone 206 for allowing a viewer individually to listen to audio, and an operation input section 207 for performing operations.
- the individual eyeglass can be identified using the unique ID (identification information) allocated to each eyeglass.
- the control section B 202 that controls the shutter eyeglass 200 a controls the power supply of the shutter eyeglass 200 a in accordance with an operation signal of a power ON/OFF button from the operation input section 207 . Also, the control section B 202 selects the signal(s) sent thereto using the unique ID described above while communicating with the video display apparatus 100 . During data transmission, the control section B 202 also adds the unique ID to data, and thereby notifies the video display apparatus 100 about which user (transmitting source) is wearing which eyeglass. The control section B 202 transmits the shutter control signal received by the reception section B 201 to the shutter driving section 203 , and transmits the audio data received by the reception section B 201 to the audio decoding section 205 .
- User operation information generated by the operation input section 207 such as eyeglass power ON/OFF information, the channel selection of broadcast channels, or input switch operation information, is wirelessly transmitted from the control section B 202 via a transmission section B 208 to the video display apparatus 100 .
- the shutter driving section 203 drives the shutter section 204 in accordance with the shutter control signal from the control section B 202 .
- the shutter section 204 is synchronized with the display operation of the display section 105 by receiving the drive signal from the shutter driving section 203 , and conducts an operation such that only the video content item selected by the user with the shutter eyeglass 200 a can be viewed.
- a liquid crystal shutter is employed for the shutter section 204 .
- the shutter section 204 controls the transmission and blockage of light depending on the ON/OFF state of the drive signal.
- the audio decoding section 205 decodes the encoded audio data from the control section B 202 into analog audio data.
- the audio decoding section 205 adjusts the audio volume in response to volume adjustment operation instructions provided from the operation input section 207 .
- the headphone 206 converts an analog audio signal output from the audio decoding section 205 into audio for output.
- the operation input section 207 includes a plurality of operating buttons and switches that are used for a user's operation. For example, a power source button for switching the power ON/OFF state of the shutter eyeglass 200 a , a broadcast channel selection button for broadcast reception, an input switch button for an external input terminal, a audio volume adjustment button, and the like are provided.
- the transmission section B 208 wirelessly transmits information indicating the power ON/OFF state of the shutter eyeglass 200 a , broadcast channel selection operation information, input switch operation information, and the like to the reception section A 106 of the video display apparatus 100 .
- the number of viewers and the number of video content items are assumed to be two.
- Input videos A to C in FIG. 2 are the input videos of the input processing sections 101 a to 101 c , respectively, and are video data to be stored in the memory 103 .
- the input video C has no data with respect to input video frames A 1 to A 4 and B 1 to B 4 , and the frame rate of each video data is 60 Hz.
- a frame group (hereinafter referred to as “FG”) represents a unit of output processing performed by the video display apparatus 100 , and is a signal for which the count value is increased one-by-one in a cycle corresponding to 60 Hz which is the frame rate common to the input videos A, B, and C.
- the numerals A 0 to A 3 representing the display videos denote the output video frames for the shutter eyeglass 200 a
- the numerals B 0 to B 3 denote the output video frames for the shutter eyeglass 200 b
- data read from the memory 103 becomes data that is delayed by 1 frame time more than the timing of the input videos A and B.
- the number of viewable video content items is 2.
- the frame rate (refresh rate) of the display section 105 according to output video data is 120 Hz.
- each of the shutter driving sections 203 of the shutter eyeglasses 200 a and 200 b is driven to open the shutter section 204 when the shutter control signal is at a HI (high) level, and to close the shutter section 204 when the shutter control signal is at a LO (low) level.
- the video time-division output processing section 104 reads video data in the order of display videos shown in FIG. 2 from the memory 103 by receiving the control command issued from the control section A 102 , and outputs the read video data to the display section 105 .
- the videos displayed on the display section 105 and the shutter driving of the shutter eyeglasses 200 a and 200 b are subjected to synchronization control by timing shown in FIG. 2 , whereby an audio-video environment for a plurality of persons is realized.
- the display section 105 displays the video frame A 1 when the image data is transmitted through the shutter (open state) of the shutter eyeglass 200 a , and the display section 105 displays the video frame B 1 when the image data is transmitted through the shutter of the shutter eyeglass 200 b.
- This control allows a user wearing the shutter eyeglass 200 a to view the video frame A, i.e., A 0 to A 3 , only in the numerical order of A 0 to A 3 as the display video. Also, a user wearing the shutter eyeglass 200 b can view the video frame B, i.e., B 0 to B 3 , only in the numerical order of B 0 to B 3 as the display video in accordance with the shutter open/close timing shown in FIG. 2 . Note that a shutter eyeglass 200 c is not operated in a power OFF state, and thus is not subjected to control.
- FIG. 4 shows the subsequent state of FIG. 2 , which shows the operations from FG 3 to FG 6 .
- the input video C is from C 5 to C 7 .
- the shutter eyeglass 200 c has been verified as being in a power ON state during the period of FG 4 and the video C 5 has been selected by the input processing section 101 c .
- the parts of the input video C and the display video which are indicated by hatching in FIG. 4 , denote that there is no video data or data is incomplete to thereby make the video viewing unpleasant.
- step S 301 shown in FIG. 3 the control section A 102 checks the number of shutter eyeglasses with their power sources turned ON at this time based on information which the reception section A 106 has received from the transmission section B 208 of each of the shutter eyeglasses 200 a to 200 c .
- the number of eyeglasses that are being used during the period of FG 3 is two.
- step S 302 the control section A 102 determines whether or not the number of shutter eyeglasses with their power sources turned ON has been increased. As a result, when the number of shutter eyeglasses is not increased, the process returns to step S 301 , whereas when the number of shutter eyeglasses is increased, the process advances to step S 303 . In the example shown in FIG. 4 , the number of shutter eyeglasses is confirmed during the periods of FG 3 and FG 4 , and the number of shutter eyeglasses is changed to three during the period of FG 4 .
- step S 304 the control section A 102 performs the setting of the video time-division output processing section 104 in order to change the frame rate of the video data to be displayed on the display section 105 , and also changes the frame rate of the shutter control.
- the frame rate is switched from 120 Hz to the changed frame rate (refresh rate), i.e., 180 Hz, starting from the display video frame C 5 .
- the timing of the vertical synchronization signal is also changed. At this time, the timing of the horizontal synchronization signal is changed in a similar manner (not shown).
- step S 305 the control section A 102 controls the video time-division output processing section 104 so as to change the display sequence of video frames during the period of FG.
- the frame of the added video content items is displayed prior in time of the frame of other video content items.
- the display sequence of video frames is changed.
- the process returns to step S 301 .
- the video frame of the added video content items is arranged at the head by the change in the display sequence of video frames.
- control section A 102 controls the video time-division output processing section 104 so as to change the order of the video frames within the period of FG from A ⁇ B to C ⁇ A ⁇ B.
- the display section 105 displays the video frames in the order of C 5 , A 5 , and B 5 during the period of FG 5 .
- the control section A 102 sends out a control signal to the shutter eyeglasses 200 a to 200 c and controls them to change the order of opening and closing of these shutters.
- the display sequence is changed from A ⁇ B to C ⁇ A ⁇ B, and during the period of FG 6 , the shutter eyeglass 200 c is in an open state while the display video C 6 is being displayed, the shutter eyeglass 200 a is in an open state while the display video A 6 is being displayed, and the shutter eyeglass 200 b is in an open state while the display video B 6 is being displayed.
- the shutter of the shutter eyeglass 200 c worn by a user is controlled to be in a closed state. This is because the breaking up of the video image should not be viewed by users during the frame period of the first video frame (C 5 ) immediately after a change in the frame rate (refresh rate) of the display section 105 .
- FIG. 6A shows the subsequent state of FIG. 2 , which shows the operations from FG 4 to FG 7 .
- the input video A does not show a video after frame A 5 .
- the input video B is the video frames B 5 to B 9 .
- the shutter eyeglass 200 a has been confirmed as being in a power OFF state during the period of FG 4 , and the video input from the input processing section 101 a has been stopped at the period of FG 5 .
- the parts of the input video A and the display video, which are indicated by hatching in FIG. 6 have the same meaning as described above.
- step S 501 shown in FIG. 5 the control section A 102 confirms the number of the shutter eyeglasses 200 a to 200 c that are switched ON.
- the number of eyeglasses is two during the period of FG 4 .
- step S 502 determination processing for determining whether or not the number of eyeglasses has been changed is performed.
- the process returns to step S 501 , whereas when the number of eyeglasses has been changed, the process advances to step S 503 .
- the number of eyeglasses is confirmed during the period of FG 4 , and the number of eyeglasses is changed to one.
- step S 504 processing for determining whether or not the period of FG has ended is performed.
- determination processing in step S 504 continues, and when the period of FG has ended, the process advances to step S 505 .
- processing waits until the period of FG 4 ends in step S 504 .
- step S 505 the display sequence in the period of FG is changed.
- the shutter of the shutter eyeglass 200 a worn by a user is controlled to be in a closed state so that the user does not view the video frame A 5 .
- step S 506 it is determined whether or not the display video is a video corresponding to an eyeglass in a power OFF state.
- the control section A 102 determines whether or not the video that is the target of determination is the video frame A 5 of the shutter eyeglass 200 a in a power OFF state as the result of the display sequence being changed to B ⁇ A during the period of FG 5 . Consequently, when the target video frame is A 5 , the process advances to step S 507 . Otherwise, the process returns to step S 505 .
- step S 507 the control section A 102 changes the setting of the frame rate of the video time-division output processing section 104 in order to change the frame rate of video data to be displayed on the display section 105 .
- the control section A 102 also changes the frame rate of shutter control.
- the frame rate is switched from 120 Hz to the changed frame rate (refresh rate), i.e., 60 Hz, starting from the display video frame A 5 of FG 5 . Subsequently, the process returns to step S 501 .
- step S 502 the number of shutter eyeglasses is confirmed during the period of FG 6 , and the number of eyeglasses is changed from three to two.
- step S 503 the control section A 102 determines that the number of eyeglasses has decreased. Then, the process advances to step S 504 , and the processing waits until the period of FG 6 ends in step S 504 .
- step S 506 it is determined that the video frame A 7 of the shutter eyeglass 200 a in a power OFF state has had its turn, and the process advances to step S 507 .
- the frame rate is switched from 180 Hz to the changed frame rate (refresh rate), i.e., 120 Hz, starting from the video frame A 7 of FG 7 , and the frame rate of shutter control is also changed in a similar manner. Then, the process returns to step S 501 .
- the changed frame rate fresh rate
- the video display apparatus 100 in the present embodiment treats the corresponding input video as black image data. Also, when the power supplies of the shutter eyeglasses 200 a to 200 c are in an OFF state, the video display apparatus 100 inactivates the shutter control signal and the audio signal, whereby the shutter opening and closing operation and audio output control are not performed.
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- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
- Controls And Circuits For Display Device (AREA)
Abstract
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Claims (8)
Applications Claiming Priority (4)
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JP2009251758 | 2009-11-02 | ||
JP2009-251758 | 2009-11-02 | ||
JP2010157793A JP4958993B2 (en) | 2009-11-02 | 2010-07-12 | Video display device and control method thereof |
JP2010-157793 | 2010-07-12 |
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US20110102561A1 US20110102561A1 (en) | 2011-05-05 |
US8670026B2 true US8670026B2 (en) | 2014-03-11 |
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US12/908,560 Expired - Fee Related US8670026B2 (en) | 2009-11-02 | 2010-10-20 | Video display apparatus capable of viewing videos by a plurality of persons using a plurality of shutter eyeglasses and method for controlling same |
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Families Citing this family (13)
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CN102823263B (en) | 2011-02-04 | 2015-12-09 | 松下电器产业株式会社 | Display unit, eyeglass device and image system |
TWI482484B (en) * | 2011-06-17 | 2015-04-21 | Wistron Corp | 3d display system and method thereof |
KR20130077742A (en) * | 2011-12-29 | 2013-07-09 | 삼성전자주식회사 | Display apparatus, and remote control apparatus for controling the same and controlling methods thereof |
CN203015041U (en) | 2011-12-29 | 2013-06-19 | 三星电子株式会社 | Display device |
DE202012104278U1 (en) | 2011-12-29 | 2013-02-11 | Samsung Electronics Co. Ltd. | Display device and remote control device for operating the display device |
CN202995143U (en) * | 2011-12-29 | 2013-06-12 | 三星电子株式会社 | Glasses device and display device |
US9277159B2 (en) | 2011-12-29 | 2016-03-01 | Samsung Electronics Co., Ltd. | Display apparatus, and remote control apparatus for controlling the same and controlling methods thereof |
KR20130077750A (en) * | 2011-12-29 | 2013-07-09 | 삼성전자주식회사 | Glasses apparatus, display apparatus, contents providing method using the sames and method for display apparatus mode conversion |
KR101309783B1 (en) * | 2011-12-30 | 2013-09-23 | 삼성전자주식회사 | Apparatus and method for display |
JP6064358B2 (en) * | 2012-04-04 | 2017-01-25 | セイコーエプソン株式会社 | Shutter device, image display system, and timing adjustment method |
JP6035823B2 (en) * | 2012-04-04 | 2016-11-30 | セイコーエプソン株式会社 | Image display device and image display method |
JP6012384B2 (en) * | 2012-10-04 | 2016-10-25 | キヤノン株式会社 | Video playback device, display control method, program, and storage medium |
US9672791B2 (en) * | 2015-01-14 | 2017-06-06 | Lenovo (Singapore) Pte. Ltd. | Actuation of device for viewing of first content frames presented on a display between second content frames |
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JPH0843766A (en) | 1994-07-31 | 1996-02-16 | Gutsudo House:Kk | Stereoscopic picture system, compound picture drawing system and device therefor |
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JP3701355B2 (en) * | 1995-10-05 | 2005-09-28 | 株式会社半導体エネルギー研究所 | Device that allows multiple observers to recognize different images |
JP2006301573A (en) * | 2005-03-23 | 2006-11-02 | Fujitsu Ten Ltd | Display device and display method |
JP2006293194A (en) * | 2005-04-14 | 2006-10-26 | Alpine Electronics Inc | Device and method for display switching |
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- 2010-07-12 JP JP2010157793A patent/JP4958993B2/en not_active Expired - Fee Related
- 2010-10-20 US US12/908,560 patent/US8670026B2/en not_active Expired - Fee Related
Patent Citations (3)
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JPH0843766A (en) | 1994-07-31 | 1996-02-16 | Gutsudo House:Kk | Stereoscopic picture system, compound picture drawing system and device therefor |
JPH10240212A (en) | 1997-03-03 | 1998-09-11 | Sony Corp | Video display device |
US6188442B1 (en) * | 1997-08-01 | 2001-02-13 | International Business Machines Corporation | Multiviewer display system for television monitors |
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US20110102561A1 (en) | 2011-05-05 |
JP4958993B2 (en) | 2012-06-20 |
JP2011118351A (en) | 2011-06-16 |
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